| CPC E21B 47/047 (2020.05) [E21B 47/095 (2020.05); E21B 47/13 (2020.05)] | 16 Claims |
|
13. A method of measuring a fluid level in a wellbore during drilling of the wellbore using a drilling system comprising a drill pipe, the method comprising:
attaching a plurality of sensor sleeves along the drill pipe,
drilling the wellbore with the drill pipe, while filling the wellbore with drilling fluid,
measuring the fluid level in the wellbore in time intervals by:
transmitting a sensing signal from each sensor sleeve in a direction of the fluid level,
receiving, by the plurality of sensor sleeves, each sensing signal reflected on the surface of the drilling fluid,
determining a distance between each sensor sleeve and the fluid level from the transmitted and received sensing signals,
determining the sensor sleeve that is closest to and above the fluid level, called the offset sensor sleeve,
determining a fluid level offset, wherein the fluid level offset is a length of the drill pipe from the offset sensor sleeve to a surface of the wellbore, and
determining the fluid level by adding the fluid level offset and the distance between the offset sensor sleeve and the fluid level.
|